Tag: Blizzard

Blizzard Ending, Then Much Calmer Weather

Scott 1 Comment

The blizzard that has brought much of southern Manitoba to a halt will end today, making way for much calmer weather.

This Week

The crippling blizzard that began last night will gradually end today. Winds this morning will be northwesterly at 40 km/h gusting to 60 km/h, decreasing as the day progresses. Snowfall will end from west to east across southern Manitoba this morning, which will also help to improve visibility. Skies will remain cloudy through the afternoon, with just a lingering chance of flurries. Roads beyond the major routes will likely be impassable today as snow drifts will be significant in many exposed areas. Luckily, calmer weather is expected for the rest of the week, giving folks a chance to recover from yet another significant December blizzard.

HRRR forecast 10m wind speeds valid 18Z Monday December 26, 2016

Tuesday will be a fairly typical winter day with high temperatures in the mid minus teens and a mixture of sun and cloud. Winds will be fairly light, helping to keep wind chill values at bay. Thankfully, this should provide decent weather for those still shoveling out from the storm.

A rapid warm-up will occur on Wednesday as a fast-moving system pushes a warm front across southern Manitoba. This front will push temperatures up close to the freezing mark in many areas, although temperatures for most of the day will be just below zero. This frontal passage may be associated with a bit of snow, but amounts will be small if there’s any accumulation at all.

Long Range

Temperatures in southern Manitoba look to follow a bit of a roller-coaster pattern for the remainder of the week. Another cool-down is expected late this week, before another possible warm-up rolls through for the weekend. This pattern may persist for the remainder of the month before a much extensive arctic air mass moves in for early January.

Forecaster Note

This will be my last regular Monday post at A Weather Moment. I have enjoyed writing my weekly forecast here, but new opportunities mean it’s time for me to give up my regular role. Thanks those that have ready my articles here every week for the past 5 years. I’ll still be a part of AWM, but in a lesser capacity. When the next storm rolls in, you’ll still be sure to hear from me!

-Scott

Update: Blizzard Snowfall Totals

Environment Canada has released a summary with snowfall totals associated with the Christmas Blizzard of 2016:

LocationSnowfall Total (cm)
Winnipeg18-33
Brandon21-25
Steinbach31
Ross30
Beausejour 20
Pinawa24
Grand Beach28
Victoria Beach18
Carman21
Winkler24
Boissevain 36
Melita 35
Miami30
Stony Mountain25
Woodlands20

Winnipeg Set To Receive A Blizzard for Christmas

Brad Leave a comment

The consensus is in: it seems overwhelmingly likely that Winnipeg will see a major winter storm bringing significant snow and blizzard conditions beginning midday on Christmas Day and persisting through Boxing Day.

The Lead-Up

Today and tomorrow will both be fairly benign days. Today will bring above-normal temperatures with a high near -4°C and light winds. A bit of cloud will be around but it should be a fairly sunny day overall. A weak cold front will swing through late this afternoon, bringing in northwesterly winds to around 20 km/h and cooler temperatures. The low tonight will drop to about -15°C with increasing cloud.

Tomorrow will be a mainly cloudy day with a much cooler high temperature near -12°C behind that cold front. Winds will continue out of the north to northeast at around 20 km/h. Temperatures will drop to a low near -15°C once agin on Saturday night with a good chance of light snow spreading into the Red River Valley from the southwest through the second half of the night.

Major Winter Storm For Christmas

The major story here is the significant winter storm set to impact Southern Manitoba on Christmas Day.

The system is currently develop off the western coast of North America. This satellite animation, taken from midnight last night, shows the long-wave trough that will evolve into a major winter storm beginning to dig southwards as it approaches the western United States. At this point, it looks like snow will intensify through the day on Sunday, with the most potent part of the storm impacting the Red River Valley roughly from 12PM Christmas Day through 12PM Boxing Day.

If you have travel plans for Christmas Day or Boxing Day, this storm will almost certainly disrupt them.

Christmas Day will start with some light snow over the Red River Valley that will intensify rapidly midday as a very potent low pressure system lifts northwards into North Dakota & Minnesota. The heaviest snow will move in by Sunday evening and persist until late Monday morning. By all indications, the snow will be relentless on Sunday night with rapid accumulations. Through this period, the wind will also be increasing out of the northeast to 40-50 km/h. The heavy snow overnight combined with strong winds will produce blizzard conditions through the Red River Valley with zero or near-zero visibilities. There is a high likelihood that most highways will be closed through the night.

The wind and snow will taper off on Monday. Fortunately, without a potent high pressure system building in from the northwest, a weak trough line hanging back across the province from the low will break up the strong winds. This should limit the period of worst travel conditions, with it seeming likely that by Monday afternoon highway travel will be possible again, although likely still slow.

AWM Snowfall Outlook for December 25-26, 2016

When all is said and done, the snowfall from this system should be quite impressive. Widespread amounts of 15-30 cm will be seen across the region, with areas south of a line running roughly from Pilot Mound through Winnipeg and Pinawa having the chance of seeing snowfall totals creep above 30 cm. At this point it looks like 30-35 cm would be the upper end of the potential snowfall totals, but there is high confidence in amounts of 20-30 cm.

Light snow and flurries may linger through the remainder of boxing day before gradually tapering off overnight or early on the 27th.

Winnipeg’s seasonal daytime high is currently -12°C while the seasonal overnight low is -22°C.

Mild Second Half of Week; Major Winter Storm Threatens Christmas

Brad 1 Comment

Temperatures will remain above-normal through the second half of the week in what has been an extremely abrupt transition from 10 days of below-normal temperatures when the temperature soared 29°C from a low of -30.5°C on Sunday morning to a high of -1.5°C on Monday afternoon. Other than some brief snow early today, the remainder of the work week will be quite pleasant with a fair amount of sunshine on tap. Christmas, however, may end up being notably worse with a second major snowstorm for December possible.

This morning will bring some light snow to Winnipeg as a shortwave rolls through the Red River Valley. The snow should taper off by mid-morning with accumulations anywhere from 1-2 cm along the Trans-Canada Highway up to 5-6 cm near the U.S. border. As the snow moves out, the cloud will break up and we’ll head into a fairly sunny afternoon with a high near -7°C. Winds will become westerly behind the low to around 20-30 km/h with some gusts on top of that. Expect the winds to continue overnight as skies remain mainly clear and temperatures drop just a couple degrees to a low near -9°C.

Thursday will be a beautiful December day with just a few clouds around and a high near -2°C. Winds will continue at 20-30 km/h, however they will be more southwesterly than westerly. Winnipeg will see a bit of overnight cloud as temperatures dip to a low near -8°C.

Winds will continue out of the west to southwest on Friday as temperatures climb to a high near -5°C under partly cloudy to mixed skies. Skies will be mixed to cloudy on Friday night with a low near -14°C.

Christmas Blizzard Possible

Long-range models have been very consistent in producing a very potent winter storm over Southern Manitoba, the Dakotas, and Minnesota beginning overnight on Christmas Eve and continuing through Christmas Day and into Boxing Day.

There is still significant uncertainty in areas that will be impacted by this storm. The only confidence at this point is that a major winter storm will likely occur somewhere in Central North America on Christmas.

While the location of the system differs between models, a common theme is that all are forecasting 20-50 cm of snow in the worst-hit areas of the storm.

Shown here are the Canadian (GDPS) and American (GFS) long-range forecasts for snowfall accumulated in a 24 hour period between 6AM Christmas Day and 6AM on Boxing Day. Both systems have a core of heavy snowfall greater than 30 cm, however where that occurs is in different places and across varying swath widths.

In general, I’m more partial to the GDPS solution as it creates a sharp deformation zone along the northern track of this system (which tends to happen) and concentrates the heaviest snow through a smaller corridor. Both these features are more physically realistic. That does not mean that I think the GDPS is right, though. Just that it seems to have a slightly more realistic handle on this system. Should the GDPS solution come to fruition, the biggest challenge would be where exactly that northern edge of the precipitation sets up.

While it’s too early to suggest any concrete plans, it would be prudent to have a “Plan B” ready if your Christmas involves travel. The heavy snow will be accompanied by strong northerly winds, likely producing widespread blizzard conditions. In areas hit by this storm, highway travel will likely be nearly impossible and air travel will likely be heavily delayed or cancelled. It seems fairly likely that travel through North Dakota and Northern Minnesota will be hazardous to impossible on Christmas Day. If you are scheduled to travel on Christmas day, it may be prudent to bump your travel day up to the 24th instead of the 25th, particularly if you’re travelling to the United States. Travel conditions will likely improve in the second half of the day on Boxing day.

If this storm materializes, it would be just 19 days after the worst winter storm in nearly a decade dumped 25-40 cm of snow across the region. Having two snow storms that produce over 20 cm of snow in a single month is rare; the last time there were two events of that magnitude was December of 1909, when the first 7 days of the month produced 70.9 cm with snowfalls between 5-19 cm each day.

We’ll be watching this storm as it develops and have a full weekend forecast on Friday.

Winnipeg’s seasonal daytime high is currently -11°C while the seasonal overnight low is -21°C.

Elsewhere in Weather News: March 21st, 2015

Matthieu Leave a comment

Maritimes Experience a Winter to Remember

With spring now in place Maritime residents would expect to see more forgiving weather than they have been experiencing this past winter. However, this has not been the case this past week. The East Coast has been hit with another strong coastal storm that brought blizzard conditions and large amounts of snow Tuesday-Wednesday. A fairly deep low pressure system was anchored just off the coast and drew in some cold air in behind – conditions right for a blizzard.

[map autofit=”1″ disable_scrollwheel=”1″] [pin]Halifax, NS[/pin] [pin]Saint John, NB[/pin] [/map]

Halifax was especially hit hard by this storm with a general 35cm falling in the city, with some higher amounts reported. These combined with winds that gusted up to 113km/h to create blizzard conditions. Schools, businesses and government offices were forced to shut down and no public transit was running. Currently, Halifax has a whopping 93cm of snow on the ground which almost doubles the old record of snow on ground of 51cm in 1967 for today (records for snow on ground have been kept since 1955 in Halifax). Saint John, NB even had more snow than that on the ground after the storm – 169cm of snow was on the ground Thursday.

Sidewalks in Halifax are getting quite narrow after the most recent snowstorm. (Source: Twitter/@HadynWatters)
Sidewalks in Halifax are getting quite narrow after the most recent snowstorm. (Source: Twitter/@HadynWatters)

Unfortunately, yet another system is set to affect the Atlantic Provinces as another strong trough makes its way towards the East Coast. The storm will really ramp up later this afternoon – numerous types of precipitation will be in play, with mostly rain near the shoreline, transitioning to mixed types and finally heavy snow as you head further inland. The highest snowfall amounts are expected to be around 40-50cm where it will be all snow, and as much as 20mm of rain could fall in Halifax. City crews have begun clearing city drains to limit the flooding that could take place if most precipitation falls as rain in Halifax.

In other news, Australia has been hit with another strong cyclone this week. The cyclone had a fairly small inner core, but still managed to bring winds of up to 170km/h near Cooktown and a decent storm surge to the coast. Thankfully no injuries were reported with the storm and it is currently in the dissipating stage over northern Australia.